internal compiler error: in lto_output_varpool_node

[MrSVCD]

I am trying to compile https://github.com/dhansel/Altair8800 from 10 of march and I get this error with arduino avr core 1.6.23:

lto1: internal compiler error: in lto_output_varpool_node, at lto-cgraph.c:624
Please submit a full bug report,
with preprocessed source if appropriate.
See http://gcc.gnu.org/bugs.html for instructions.
lto-wrapper: fatal error: /home/ghostwolf/Program/arduino-1.8.9/hardware/tools/avr/bin/avr-gcc returned 1 exit status
compilation terminated.
/home/ghostwolf/Program/arduino-1.8.9/hardware/tools/avr/bin/../lib/gcc/avr/5.4.0/../../../../avr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
exit status 1
Error compiling for board Arduino/Genuino Mega or Mega 2560.

[MrSVCD]

Arduino AVR Boards version 1.6.21 does compile the code without errors.

[MrSVCD]

I am running x86-64 Ubuntu-mate 18.04. Sorry for not including that from the start.

[per1234]

Closing as duplicate of arduino/ArduinoCore-avr#39

Also related: #7949

The issue is specific to the avr-gcc 5.4.0 used by Arduino in Arduino AVR Boards 1.6.22 and 1.6.23. As you discovered, a reasonable workaround is to use Arduino AVR Boards 1.6.21 until a new release of Arduino AVR Boards comes out that doesn't use the problematic avr-gcc version.

There is also a workaround for your particular error described here:
arduino/ArduinoCore-avr#39 (comment)